1525 results about "Switched reluctance motor" patented technology

A method of assembling a power tool, a power tool, a method of assembling an electrical device, and an electrical device includes a switched reluctance motor. The electrical device is preferably a hand-held power tool, however, any type of electrical device that includes a switched reluctance motor may benefit from any number of aspects of the invention. In one independent aspect, the invention provides a construction that reduces tolerance stack-up. In another independent aspect, the invention provides a self-contained electronics package that plugs into a switched reluctance motor to provide control operation of the switched reluctance motor. In another independent aspect, the invention provides enhanced cooling that increases the efficiency of the electrical device using a switched reluctance motor. In another independent aspect, the invention provides an encapsulated magnet that allows for contaminant free motor control over the life of the SR motor. In another independent aspect, the invention provides an apparatus and a method for aligning magnets of a magnet hub with respect to the rotor poles the magnet poles represent.

Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a plurality of phase windings and a rotor that rotates relative to the stator. A drive is connected to the phase windings for energizing the windings. A controller outputs a control signal to the drive in response to an input demand such as a demanded speed or torque. Control methods (which can be implemented separately or in combination) include varying the gain of an estimator as a function of a demanded or estimated speed to position control system poles at desired locations, decoupling control system currents to achieve a constant torque with motor speed, compensating flux estimates of the estimator for saturation operation of the stator, estimating rotor position using averages of sample values of energization feedback, and calculating a trim adjusted speed error from a plurality of speed estimates.

A flywheel energy storage system emphasizing enhancements developed for space applications including development of a flywheel rotor system capable of achieving maximum energy density, while being capable of repeated high peak-power demands. Illustrated is a rotor system comprising a composite hub, capable of supporting an optimized high-speed composite rim and shaft, working in combination with a switched reluctance motor.

An electrical machine, such as a switched reluctance motor, has a rotor and at least one electrically energizable phase winding. A control map is derived during production that includes a predetermined advance angle profile representing the energization of the phase winding with respect to the angular position of the rotor over a range of rotor speeds. This is stored in memory in a controller together with an angle correction factor to be applied to a predetermined portion of the advance angle profile. The angle correction factor compensates for the difference between a desired input power and the measured input power. The correction factor may be transmitted to the controller by means of radio frequency signals.

A unipolar drive includes a booster, an energy storage module, and a unipolar inverter. The booster increase a voltage received from a power supply to produce an energy output. The energy storage module store at least some of the energy output by the booster. The unipolar inverter energizes windings of a motor using energy from the booster and returns energy from the windings to the booster when the windings are not being energized.

The invention discloses a topological structure of a power converter of an electric car switch reluctance motor. A two-way Buck-Boost converter is added to the front portion of a dissymmetric half-bridge power converter of the switch reluctance motor. When the switch reluctance motor operates in the power-driven state, boosting of a storage battery is achieved through a forward Boost-DC/DC converter body, so that electricity is provided for the dissymmetric half-bridge power converter of the switch reluctance motor; when the switch reluctance motor operates in the braked state, the storage battery is charged by the dissymmetric half-bridge power converter of the switch reluctance motor through a backward Buck converter, so that kinetic energy of an electric car is converted into electric energy of the storage battery; when the electric car operates in the charging state, the switch reluctance motor does not rotate, a vehicle-mounted charger is formed by an alternating current power source through a winding of the switch reluctance motor and the dissymmetric half-bridge converter, the storage battery is directly charged by the vehicle-mounted charger, an externally-connected element is not needed, an alternating current is converted into a direct current, the storage battery is charged by the direct current through a Buck converter body, so that power factor correction is achieved, the reliability and the flexibility of a system are effectively improved, the practicality is high, and the universality is strong.

A full-pitch winding switched reluctance motor is provided. In this motor, one set of current components are estimated, which electromagnetically act on only one set of stator poles for one phase. Based on the estimated one set of current components, current components for respective three phases are controlled, resulting in accurate current control with no electromagnetic interactions with other phases. This current control allows a control circuit to be made compact, and a motor with effective field means can be provided.

The invention provides an electronic multi-gear variable-speed motor of the electric vehicle and a control system thereof. The electronic multi-gear variable-speed motor of the electric vehicle and the control system are characterized in that a field effect transistor or an IGBT tube is used for controlling switching among different connection modes of three-phase connection mode, six-phase connection mode, star-shaped connection mode, triangular connection mode, polygonal connection mode, serial connection mode, parallel connection mode, single connection mode, single-tap connection mode and double-tap connection mode; the equivalent impedance of a motor winding is changed for realizing gearshift speed change; the electronic multi-gear variable-speed motor is used for a DC permanent-magnet brushless motor which is controlled by a multiphase winding and multiple phase, a DC permanent-magnet synchronous motor, a switched reluctance motor, an AC motor, a main driving motor and a hub motor; wherein a multiphase winding and multiphase control are used in the motors; and through speed control software, in-gear speed control is slowly performed at the end switching part and the starting switching part of each speed gear through speed control software, thereby realizing switching without vibration.

The invention provides a method for detecting rotor position of a switch reluctance motor without a position sensor, and belongs to the field of motor control. The invention aims at solving the problems existing in the prior method for indirectly detecting the rotor position that resisting moment and moment harmonic components occur in the motor rotor so that the efficiency of a motor system is reduced. The method comprises the following steps: 1, winding current i and busbar voltage U are sampled; and 2, according to the winding current in step one, instantaneous inductance (L) of the winding is acquired, and by looking up the winding instantaneous inductance (L) and rotor angle relation table, the rotor position is acquired. The method can lower manufacturing process of the switch reluctance motor, and has good application prospect in oil fields, coal mines, elevators, home appliances and the like.

According to one embodiment of the invention, a method includes generating, by a computer, a phase current profile, generating a phase current according to the phase current profile, and applying the phase current to the switched reluctance motor drive. Generating the phase current profile includes initializing one or more first profile parameters which define at least a first portion of the phase current profile. Generating the phase current profile also includes determining whether a first performance criterion is satisfied based on operation of the switched reluctance motor drive using the first profile parameters. Generating the phase current profile also includes updating at least one the first profile parameters if the first performance criterion is not satisfied.

Disclosed herein is a switched reluctance motor, including: a rotor provided with a plurality of salient poles protruded along an outer peripheral surface thereof; and a stator including a plurality of stator cores in a pi (π) shape that have the rotor rotatably accommodated therein, are opposite to the plurality of salient poles, and have coils wound therearound, wherein a magnetic flux path is formed along the stator cores in the pi shape and the salient pole opposite thereto.

The invention discloses a sectional type switch reluctance motor, belonging to the field of magnetic circuit components. The sectional type switch reluctance motor comprises a main shaft, at least two sections of stators, at least two sections of rotors and magnetic isolating plates arranged on the main shaft, wherein each section of the stators and each section of the rotors are respectively provided with magnetic isolating plates, and each section of the stators and each section of the rotors are uniformly distributed around 360 degrees in the axial direction respectively. Stator poles of each phase of each section of the stators are respectively connected in series and are connected with a one-way guide circuit; the one-way guide circuit comprises four rectifier diodes, energy storage capacitors, main control thyristor switches and guide thyristor switches which are connected in series two by two; series circuits of each stator pole are mutually connected in parallel; one ends of the series circuits are respectively connected with the main control thyristor switches and guide thyristor switches; and the middles of two series circuits of the rectifier diodes are respectively connected with two output ends of the alternative current. By utilizing the sectional type switch reluctance motor, output torque pulse can be effectively reduced, and by guiding the induced current among the sections, the energy consumption efficiency of a system is improved, the impact of the induced current to the components is reduced, and the service life of the system is prolonged.

A power converter for a switched reluctance motor or a permanent magnet brushless direct current (dc) motor may include first and second partial circuits for forming multiple conduction circuits in cooperation with first and second phase windings of the motor. The controller also includes a switch operable to open and close a first conduction circuit, which includes the first phase winding, and to regulate energization of the first and second phase windings of the motor through opening and closing the first conduction circuit. Control of the switch provides four-quadrant operation of the motor through regulated energization of the first and second phase windings.

A frameless switched reluctance motor (SRM) has a stator sandwiched between two housings. Axial load on the rotor shaft is directed through a first bearing, through the first housing to the stator and through the second housing to a motor support. Heat is dissipated using low-loss electrical steel, one or more air movers and air passages through the motor. Preferably a stator profile enables the air passages to be formed through the stator's lamination stack. Optionally air is routed through passages between the coils and through air passages along the air gap and radially through passages between an upper and a lower stator. A first self aligning bearing adapts to misalignment between the first housing and the shaft and a second bearing is provided with transverse movement. Preferably, the frameless motor is adapted for support to a wellhead for driving a downhole rotary pump and a rotary rod string.

A circuit arrangement for operating a solenoid actuator, for example, an electric motor provided in the form of a switched reluctance motor, permits operation of the motor in the event of malfunction or failure of part of an energy supply. The circuit arrangement advantageously includes an auxiliary battery serving as a redundance in addition to a main battery. The auxiliary battery is smaller and has a lower nominal voltage than the main battery. In order to permit continued operation of the electric motor in the event of failure, with a nominal operating voltage which is adapted to the nominal voltage of the main battery, a capacitor which can be switched on and off is connected in series to the batteries. An energy quantity can be accumulated in the capacitor by switching the current switching through an exciter winding of the electric motor in the manner of a switching regulator, whereby the nominal voltage of the capacitor finally exceeds the voltage in the auxiliary battery. When a sufficient quantity of energy has been accumulated, the electric motor can be actuated for a short time by means of the energy accumulated in the capacitor. Electrically actuated braking systems in commercial vehicles represent a significant and preferred area of application for the invention.

An electrical motor system comprises a switched reluctance electrical motor comprising a rotor section and a stator section, the rotor section comprising a plurality of rotor teeth and the stator section comprising a plurality of stator teeth, the stator teeth wound with respective coils. Coil driver circuitry is coupled to the coils of the stator teeth and controls an independent phase of electrical power to each coil of the plurality of stator teeth. The coils of the stator teeth each have an inductance which absorbs electrical energy provided to that coil by the coil driver circuitry and subsequently releases at least a portion of the electrical energy back to the coil driver circuitry when that coil is not being actively driven by the coil driver circuitry. The coil driver circuitry comprises an electrical energy store configured to store the portion of the electrical energy released back from the inductance of each coil and the electrical energy provided to each coil of the stator teeth by the coil driver circuitry is augmented by the electrical energy stored in the electrical energy store.

A two-phase switched reluctance motor in an embodiment includes a plurality of salient rotor poles that each have asymmetric reluctances about a central radial axis of the respective rotor pole. Each of the rotor poles has the same width, and the rotor poles are operable to provide preferential torque generation in one direction of rotation for all rotor positions. Such preferential torque generation occurs under the influence of an electromagnetic flux, which is provided by a plurality of salient stator poles having substantially the same width as the rotor poles.

A system and methodology for control of a switched reluctance electric machine comprising: a switched reluctance electric machine including a sensor generating and transmitting a sensor signal indicative of an operating characteristic; a controller operatively coupled to the switched reluctance motor and the sensor; and the controller executing a method. The method comprises: probing a selected diagnostic phase with a pulse injection process; measuring an actual operating characteristic of the switched reluctance electric machine; computing an inductance based on the actual operating characteristic and correlating the inductance with a position to formulate an estimated position; modeling the switched reluctance electric machine to formulate an observer-based estimated position; selecting at one of the estimated position, the observer-based estimated position, and a combination thereof to formulate a selected position of the switched reluctance machine; and controlling said switched reluctance machine based on said selected position and a command.